Patch-Source: https://src.fedoraproject.org/rpms/dnsmasq/blob/f36/f/0014-Fix-coverity-detected-issues-in-dnsmasq.c.patch (backport from upstream)
--
From f476acbe3c2830e6ff0c50cc36d364a3f3f4fadb Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Petr=20Men=C5=A1=C3=ADk?= <pemensik@redhat.com>
Date: Fri, 3 Sep 2021 22:45:29 +0200
Subject: [PATCH 14/15] Fix coverity detected issues in dnsmasq.c

diff --git a/src/dnsmasq.c b/src/dnsmasq.c
index 602daed..3e1bfe8 100644
--- a/src/dnsmasq.c
+++ b/src/dnsmasq.c
@@ -34,7 +34,6 @@ static void poll_resolv(int force, int do_reload, time_t now);
 
 int main (int argc, char **argv)
 {
-  int bind_fallback = 0;
   time_t now;
   struct sigaction sigact;
   struct iname *if_tmp;
@@ -59,6 +58,8 @@ int main (int argc, char **argv)
   int did_bind = 0;
   struct server *serv;
   char *netlink_warn;
+#else
+  int bind_fallback = 0;
 #endif 
 #if defined(HAVE_DHCP) || defined(HAVE_DHCP6)
   struct dhcp_context *context;
@@ -377,7 +378,7 @@ int main (int argc, char **argv)
 	      bindtodevice(bound_device, daemon->dhcpfd);
 	      did_bind = 1;
 	    }
-	  if (daemon->enable_pxe && bound_device)
+	  if (daemon->enable_pxe && bound_device && daemon->pxefd != -1)
 	    {
 	      bindtodevice(bound_device, daemon->pxefd);
 	      did_bind = 1;
@@ -920,8 +921,10 @@ int main (int argc, char **argv)
     my_syslog(LOG_WARNING, _("warning: failed to change owner of %s: %s"), 
 	      daemon->log_file, strerror(log_err));
   
+#ifndef HAVE_LINUX_NETWORK
   if (bind_fallback)
     my_syslog(LOG_WARNING, _("setting --bind-interfaces option because of OS limitations"));
+#endif
 
   if (option_bool(OPT_NOWILD))
     warn_bound_listeners();
@@ -1575,7 +1578,7 @@ static void async_event(int pipe, time_t now)
 	  {
 	    /* block in writes until all done */
 	    if ((i = fcntl(daemon->helperfd, F_GETFL)) != -1)
-	      fcntl(daemon->helperfd, F_SETFL, i & ~O_NONBLOCK); 
+	      while(retry_send(fcntl(daemon->helperfd, F_SETFL, i & ~O_NONBLOCK)));
 	    do {
 	      helper_write();
 	    } while (!helper_buf_empty() || do_script_run(now));
@@ -1984,7 +1987,7 @@ static void check_dns_listeners(time_t now)
 		 attribute from the listening socket. 
 		 Reset that here. */
 	      if ((flags = fcntl(confd, F_GETFL, 0)) != -1)
-		fcntl(confd, F_SETFL, flags & ~O_NONBLOCK);
+		while(retry_send(fcntl(confd, F_SETFL, flags & ~O_NONBLOCK)));
 	      
 	      buff = tcp_request(confd, now, &tcp_addr, netmask, auth_dns);
 	       
-- 
2.31.1